/Engine/Source/Runtime/Core/Public/Misc/StringBuilder.h
template<typename OtherCharType, std::enable_if_t< [TIsCharType](API\Runtime\Core\Traits\TIsCharType)< OtherCharType >::Value > *> [BuilderType](API\Runtime\Core\Containers\TStringBuilderBase\BuilderType) & Append ( const OtherCharType *const String, const int32 Length )